Hi Frank,
I think preg_replace_callback is a good solution for you.
If you don't want to use it, you can construct two arrays defining
matches and replacements.
For example:
$matches
[230]
[120]
[340]
$replacements
[9.1]
[replace2]
[replace3]
After you stored matches in $matches using regular expression like
yours,/preg_match_all
<http://it.php.net/manual/en/function.preg-split.php>/
(([[:digit:]]+|[[:digit:]]+\.[[:digit:]]+)([[:blank:]]?)(mm), $string,
$matches, PREG_SET_ORDER)
you can define $replacements by this way:
for(int =0; i<count($matches); i++){
$replacements[$i]=round((substr($matches[$i][0], 0,
3))*0.039370079),1); //take the last part of match with no digits, I
don't know if there are sure 3 digits
}
for(int i=0; i<count($matches); i++){
preg_replace($string, $matches[$i][0], $replacement[$i]."in");
}
hope to help you
Ilaria
Frank Arensmeier wrote:
Hello all.
Is it possible to have a user defined function for the replacement
within an ereg_replace (like preg_replace_callback)? I am working on
a script that converts html pages with metric data into imperial
data. My script takes text strings containing one or more instances
of e.g. "123 mm", "321 mm", "123 kg", "123 cm2" and so on. The script
searches the string with a pattern like:
"([[:digit:]]+|[[:digit:]]+\.[[:digit:]]+)([[:blank:]]?)(mm)"
When the script finds an instance, it stores the matches into an
array - ereg ( $pattern, $textstring, $matches )
The replacement (for mm) looks like:
round ( ( $matches[1] * 0.039370079 ), 1 ) . $matches[2] . "in"
Everything is working great accept when the string contains more than
one instance for example of the metric unit mm. In that case, all
instances of "xy mm" will be replaced with the first occurrence.
So, a text like:
"The product is 230 mm tall, 120 mm thick and 340 mm wide" will
output as "The product is 9.1 in tall, 9.1 in thick and 9.1 in wide"
- because the replacement string is based / calculated on the first
occurrence 230 mm.
Alternatively, is there a way to limit ereg_replace to only replace
one instance at a time?
Hopefully I am not too confusing...
regards,
/frank
ps. of course I have searched the manual and asked Google - no luck ds.
--
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De Marinis Ilaria
Settore Automazione Biblioteche
Phone: +3906-44486052
CASPUR - Via dei Tizii ,6b - 00185 Roma
e-mail: demarinis@xxxxxxxxx
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